B4.1 The blood

Question 1

What does the human circulatory system consist of?

Answer 1

Blood - blood vessels - and the heart

Question 2

What does plasma carry?

Answer 2

Red blood cells
White blood cells
Platelets

Question 3

What does the blood plasma transport?

Answer 3

Waste carbon dioxide produced by the cells is carried to the lungs
Urea formed in the liver from the breakdown of excess proteins is carried to kidneys

Question 4

What are the adaptions of red blood cells in order to carry oxygen around?

Answer 4

Biconcave disc - increase surface area to volume ratio for diffusion
Haemoglobin that binds to oxygen
Have no nucleus making more space for haemoglobin

Question 5

What is the purpose of the white blood cells?

Answer 5

Helps protect your body against microorganisms and bacteria

Question 6

How do white blood cells protect your body?

Answer 6

Producing antitoxins
Phagocytes engluf and digest bacteria
Produce antibodies

Question 7

What are the purpose of platelets?

Answer 7

Help the blodo to clot at the site of a wound